x86/mm: Fix cpumask_of_node() error condition

When CONFIG_DEBUG_PER_CPU_MAPS=y we validate that the @node argument of
cpumask_of_node() is a valid node_id. It however forgets to check for
negative numbers. Fix this by explicitly casting to unsigned int.

  (unsigned)node >= nr_node_ids

verifies: 0 <= node < nr_node_ids

Also ammend the error message to match the condition.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Yunsheng Lin <linyunsheng@huawei.com>
Link: https://lkml.kernel.org/r/20190903075352.GY2369@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index e6dad60..4123100 100644 (file)
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -861,9 +861,9 @@ void numa_remove_cpu(int cpu)
  */
 const struct cpumask *cpumask_of_node(int node)
 {
-       if (node >= nr_node_ids) {
+       if ((unsigned)node >= nr_node_ids) {
                printk(KERN_WARNING
-                       "cpumask_of_node(%d): node > nr_node_ids(%u)\n",
+                       "cpumask_of_node(%d): (unsigned)node >= nr_node_ids(%u)\n",
                        node, nr_node_ids);
                dump_stack();
                return cpu_none_mask;